🏷️ Basic Information Identification Make: Subaru Model: Impreza WRX STI Year: 2004 Chassis Code: GDB (GD chassis, STI variant) Market Segment: Compact Performance Sedan / Rally Homologation Special 👋 Introduction Market Position Positioning: The 2004 Subaru Impreza WRX STI (GDB) represented the pinnacle of Subaru's rally-bred performance and homologation specials for the compact car segment, directly competing with vehicles like the Mitsubishi Lancer Evolution. Competitive Analysis Competitors: Mitsubishi Lancer Evolution VII/VIII, Honda Civic Type R (EP3 - though different class/powertrain), Ford Focus RS Mk1. Key Features Performance Enhancements: Larger EJ207 engine, twin-scroll turbocharger, DCCD, reinforced chassis, larger brakes, specific STI suspension tuning, aggressive aerodynamic body kit. Rally Heritage: Designed with World Rally Championship (WRC) homologation in mind, sharing many characteristics with Subaru's successful WRC cars. 📋 Manual Details Coverage Areas Primary Regions Covered: Global (with focus on markets where STI was officially sold or widely imported) Trim Levels Covered: WRX STI (all specific STI variants for 2004 model year) Page Count Estimated Pages: 1000+ Manual Type Type: Factory Service Manual / Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine: EJ207 (2.0L DOHC Turbocharged Boxer), including timing, lubrication, cooling, fuel injection, ignition, emissions, and turbocharger systems. Transmission: 6-speed manual transmission (TY757), including clutch, driveline, and AWD system (Driver Controlled Centre Differential - DCCD). Suspension And Steering: Front MacPherson struts, rear multi-link suspension, power steering system. Brakes: Front and rear disc brakes (including potential Brembo caliper specifics if applicable to 2004 STI), ABS system. Electrical System: Wiring diagrams, fuses, relays, battery, charging system, lighting, instruments, ECUs, body control modules. Body And Chassis: Body panels, interior trim, glass, structural components, corrosion protection. HVAC: Heating, ventilation, and air conditioning systems. Procedures Included Maintenance: Oil changes, filter replacements, fluid checks and top-offs, spark plug replacement, belt inspections. Repair: Engine component rebuilds (pistons, rods, bearings), turbocharger service, transmission overhaul, suspension component replacement, brake caliper/rotor service, electrical component diagnosis and repair. Diagnostics: Troubleshooting guides, diagnostic trouble codes (DTCs), symptom-based diagnostics. Installation: Component replacement procedures, accessory installation guidelines. Technical Depth Depth: Comprehensive: Covers basic maintenance to complete engine and transmission rebuilds, including detailed diagnostic procedures and specifications. 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text content Print Quality Printability: Printable in its entirety or by individual sections/pages Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: EJ207 Engine Type: Horizontally Opposed (Boxer), 4-Cylinder, DOHC, 16-Valve Displacement: 1994 cc (2.0 Liters) Bore X Stroke: 92.0 mm x 75.0 mm Compression Ratio: 8.0:1 Performance Horsepower: 265 PS (approx. 261 hp) @ 6000 rpm (JDM specification, may vary slightly for export markets) Torque: 343 Nm (approx. 253 lb-ft) @ 4000 rpm (JDM specification, may vary slightly for export markets) Redline: 8000 rpm Fuel System Fuel Delivery: Multi-point fuel injection (MPI) Turbocharger: IHI VF37 (Twin-scroll) Fuel Type: Premium Unleaded Gasoline (95 RON or higher) 🔧 Transmission Standard Type: 6-speed Manual Transmission Transmission Code: TY757 Features Drivetrain: All-Wheel Drive (AWD) with Driver Controlled Centre Differential (DCCD) Clutch Type: Hydraulic, multi-plate 📐 Dimensions Exterior Length: 4405 mm (173.4 in) Width: 1770 mm (69.7 in) Height: 1440 mm (56.7 in) Wheelbase: 2625 mm (103.3 in) Weights Curb Weight: Approx. 1440 kg (3175 lbs) Gross Vehicle Weight Rating: Not specified in basic info, typically found in manual. 🛡️ Safety Features Ratings NHTSA Crash Tests: Specific NHTSA ratings for 2004 STI are not widely publicized or may vary by market; later GD chassis models received varying ratings. Active Features Traction Control: Standard Subaru All-Wheel Drive with DCCD, ABS. Brake Assist: Likely included with ABS depending on market. Passive Features Airbags: Front airbags (driver and passenger), potential side airbags depending on market/trim. Seatbelts: Pre-tensioner seatbelts Chassis Reinforcement: Enhanced chassis rigidity for rally performance. 💡 Technology Features Infotainment Head Unit: Factory fitted radio/CD player; often upgraded by owners for modern features. Gauges: Performance-oriented instrument cluster including boost gauge and DCCD indicator. Driver Assistance ABS: Anti-lock Braking System (ABS) standard. AWD System: Subaru's Symmetrical All-Wheel Drive with Driver Controlled Centre Differential (DCCD) offering manual and automatic locking modes. Connectivity Original Connectivity: Basic; no integrated Bluetooth or USB ports in the factory system. 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,750 miles (6,000 km) or 3 months, whichever comes first (severe driving conditions often recommended for performance vehicles). Timing Belt Interval: Every 60,000 miles (96,000 km) or 4 years (critical for EJ series engines). Fluid Specifications Engine Oil: Subaru recommends 5W-30 or 10W-30 synthetic oil. Refer to manual for exact API service classification (e.g., API SN or newer). Coolant: Subaru Super Coolant (Blue) or equivalent ethylene glycol-based coolant with corrosion inhibitors. Mixture of 50/50 with distilled water. Transmission Fluid: Subaru Extra-S Gear Oil (Hypoid Gear Oil, GL-5) for 6-speed transmission. Capacity approx. 3.4 L (3.6 US qt). Differential...